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Attachment 19298
Could there be a problem with the master cylinder check valve which I assume the DF has? Maybe a bit of something that does not allow the valve to seal?
I would bleed/flush the fluid first to see if that would cure the problem. If that didn't work then disassemble the master cylinder to look at the check valve.
The check valve holds about 2psi in the system to keep the pistons from returning when the lever is released but it's not enough pressure to cause brake drag. Over on chinariders, there was a member that had a similar problem. He removed the master cylinder and did an old fashion bench bleed. During the bleed, some hardened chunky brake fluid debris came out of the hole that allows fluid to travel down through to the piston. You should be able to disassemble and clean the master cylinder without dmaging any seals. I have done it on my Jap bikes with no problems.
ya ill clean it out before killing myself looking for a rebuild kit...
EDIT:
cleaned it out. nothing to be found.
no definitive measurements but the piston/seals seemed to fit a bit loose in the bore for a high pressure sealing brake system.
well i guess the definitive measurement would be almost not enough pressure to push fluid out the bleeder so... need new seals.
but it seems the rebuild kits are a bit confusing as each seems to be built a bit differently.
Does anyone have a part number on a kit?
Thing is entire new master cylinder parts i'm finding just as low priced...
And there are no nicks or tears in the seals, im not so confident new seals would improve things, these brakes have always been weak, perhaps my bore was a bit wide...
i did find what seems an exact new part though...
http://www.ebay.com/itm/181969475724
i may well go this route short of a definitive rebuild kit part number, and hopefully reuse my modified adjustable levers without having to do all that work again.
Snap, taking a close look at this diagram, when i took the cylinder off and up to the bench, i remember seeing the primary cup, secondary cup, but no check valve?!Quote:
Originally Posted by barnone
also rebuild kits don't seem to come with one so i didnt notice anything missing...
I cant imagine they even worked as poorly as they did before without a check valve...
thanks for the pic, I'll investigate, but like i mention none of the similar rebuild kits even list a check valve, are you guys sure there is even one?
Quote:
Originally Posted by ben2go
This video matches and displays what parts are found in the DF master cylinder pretty well...
there is no check valve, im not sure what you're talking about...
Some don't have check valves. Usually, the master cylinder being above the caliper will do the trick. Also, the reservoir getting low can cause a bit of suction pulling the caliper in. The rubber seal doesn't let air into the system because brake fluid is hygroscopic and absorbs water from the air. As the fluid level drops, if the bellows in the seal doesn't drop as well, there will be a vacuum created in the master cylinder, which will pull the caliper piston back. This is why the master cylinder cap seal is made the way it is.
some dont have it eh... plenty of info on the web about other bikes wouldnt you say.... you had me running around for an hour looking where i could have dropped the seal :rolleyes1:Quote:
Originally Posted by ben2go
Sorry bout that. I should have known the china bikes wouldn't have them as a cost cutting measure.Quote:
Originally Posted by axa
axa, we were trying to help you.Quote:
Originally Posted by axa
That is the thanks you get for trying to help axa!Quote:
Originally Posted by ben2go
Quote:
Originally Posted by barnone
Since i for one don't much get upset from talking to strangers on the internet... i will assume you don't either...
though i do get the 'grumpy old man' impression from barnone...
so everyone should keep in mind on the internet text is read out of emotional context
axa,
You ask for help and then have a wise ass reply when it doesn't work out. Don't worry as you will never get any help from me in the future. You are the grumpy old man here and have proven it many times.
Interesting. Sold by Dongfang Motor Inc. On Amazon.
Attachment 19333
SSold by Dongfang Motor Inc.www.df-motor.com/
https://smile.amazon.com/gp/product/B01IT7MW9M/ref=pe_2529240_240885810_em_1p_0_lm
I do like that green one. I was thinking about the blue one a few years back, but my idea of riding changed drastically over the years.
I rryAttachment 19336
we don't have a website for selling a series of parts currently, only several parts, could you please let me know which pand
I received a reply from the seller of the DF on Amazon that they do have parts for sale. Email dongfangmotorinc@gmaul.com
http://www.df-motor.com/index.asp
I have used that email before about parts and never have gotten any reply. But maybe I was asking too much.All I wanted was a new motor, when the other broke.
Also that looks like the same photos from these two bikes for sale on ebay..
http://www.ebay.com/itm/182221096408...%3AMEBIDX%3AIT
http://www.ebay.com/itm/182221096407...%3AMEBIDX%3AIT
By the way.. I did get my parts for the repair job on the forks. Weather has been crappy.. lots of rain.No time to work on her. actual exact parts. Took less than a week to get them.
ya ya mr grouchy, who needs it...Quote:
Originally Posted by barnone
anyway, exact replacement brake clutch, complete and cheap:
eBay item number:112345803451
awesome great to know. I have only had one issue with the brake master fro the front. That little window on it seems to be some sort of plastic.The brake fluid dissolves it after a while.It cracked so bad on the first one It leaked like crazy.I replaced it.. the second one is in similar disarray but not too bad no leaks yet. I will keep this link in mind for future replacement.
was wondering.. is this the same carburetor that is on this bike?
http://www.ebay.com/itm/191611954772...%3AMEBIDX%3AIT
my bike has had a couple carb issues and i am considering replacing it.I have cleaned it like twice, but it sputters every so often.
Mikuni VM26 (& copies) is the answer. BOTH jets is easy to find in local powersport shopQuote:
Originally Posted by bowtiewagon
Very cool thanks.Quote:
Originally Posted by humanbeing
Well I did it finally. Weather is good, got up, and swapped out the bent shocks.
bent ones off....
Attachment 19350
new ones on...
Attachment 19351
have not ridden yet.. may go in a bit.. hot out. Relaxing from working. Was relatively easy to do. Kind of weird how they are in there. basically just clamped in. no bolts hold them in at all. two bolts just clamp around them in a sleeve, and that is it.
ok took her for a ride, and man are these shocks stiff. so bad that I cannot even see out my mirrors, they are just vibrating so bad they are noting but fuzz when I look at them while riding. Is there a way to adjust these shocks for a softer ride? I do not want to mess with the nuts on the top of them until I know for sure that is what they are for? I hear these are under tension and the last thing I need is to twist the nut and they pop out on me.
The forks probably came dry and need fluid in them. They take 10w fork oil and some riders use ATF. I'm not sure how much is required per fork. Maybe HumanBeing will have that information. As far as the internals, you'll have a spacer, washer, spring, and the dampening rod. The dampening rod is bolted into the bottom of the slider and keeps the fork from separating when it becomes fully extended.Quote:
Originally Posted by bowtiewagon
wow ,I appreciate the information. Was not aware they came dry. I will remove them and have them looked at. You would think buying parts they would come complete.Quote:
Originally Posted by ben2go
You can loosen the top clamp bolt on the triple clamp, remove the fork cap, and look down inside without removing them.Quote:
Originally Posted by bowtiewagon
would that also be where to fill them up?Quote:
Originally Posted by ben2go
Yes, but you'll need to know how much to fill them with. To little and you'll burn up the bushing and not get any dampening. To much and the ride will be extremely stiff or lock up the forks. When you remove the caps, keep pressure on them, so the spring doesn't pop off the cap.Quote:
Originally Posted by bowtiewagon
interesting. I have searched for how much to put in, but you know how it is with this bike. Trial and error. I think what I might do,it disassemble one old shock, pour out the oil and estimate how much is in that, then go from there. hopefully that will give me a figure that will work.